SSH Without a Password

The following steps can be used to ssh from one system to another without specifying a password.

Notes:

Steps:

  1. On the client run the following commands:

    $ mkdir -p $HOME/.ssh
    $ chmod 0700 $HOME/.ssh
    $ ssh-keygen -t dsa -f $HOME/.ssh/id_dsa -P ''
    
    This should result in two files, $HOME/.ssh/id_dsa (private key) and $HOME/.ssh/id_dsa.pub (public key).
  2. Copy $HOME/.ssh/id_dsa.pub to the server.

  3. On the server run the following commands:

    $ cat id_dsa.pub >> $HOME/.ssh/authorized_keys2
    $ chmod 0600 $HOME/.ssh/authorized_keys2
    
    Depending on the version of OpenSSH the following commands may also be required:
    $ cat id_dsa.pub >> $HOME/.ssh/authorized_keys
    $ chmod 0600 $HOME/.ssh/authorized_keys
    
    An alternative is to create a link from authorized_keys2 to authorized_keys:
    $ cd $HOME/.ssh && ln -s authorized_keys2 authorized_keys
    
  4. On the client test the results by ssh'ing to the server:

    $ ssh -i $HOME/.ssh/id_dsa server
    
  5. (Optional) Add the following $HOME/.ssh/config on the client:

    Host server
             IdentityFile ~/.ssh/id_dsa
    
    This allows ssh access to the server without having to specify the path to the id_dsa file as an argument to ssh each time.

Helpful manpages:

Translations:


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$Id: ssh_nopass.html 1310 2013-04-22 22:15:26Z ranga $